In recent years, the transmission/reflection (TR) method has been successfully emplolyed to determine the complex permittivity of dielectric material. Based on the principle that different coals have different abilities to absorb microwave energy at different frequencies, it is essential to analyze the electromagnetic property of coal to realize microwave desulfurization. Samples composed of a known dielectric and coal are manufactured in order to obtain the accurate permittivity of coal. In the article, we propose an improved TR method which is insensitive to the position of the sample in its cell. Additionally, we get the suitable mass ratio of the known dielectric and sample under test in the composite sample, and the suitable thickness of the composite sample in the permittivity measurements.
2. Zhao, H., Y. Li, Y. Qu, Z. Duan, J. Zhang, and J. Liu, "Experimental study on microwave desulfurization of coal," ICMREE, Vol. 2, 1706-1710, May 2011.
3. Estin, A. J. and H. E. Bussy, "Errors in dielectric measurements due to a sample insertion hole in a cavity," IEEE Trans. Microwave Theory & Tech., Vol. 8, No. 6, 650-653, Nov. 1960.
4. Ghodgaonkar, D. K., V. V. Varadan, and V. K. Varadan, "A free-space method for measurement of dielectric constants and oss tangents at microwave frequencies," IEEE Transactions on Instum. Meas., Vol. 37, No. 3, Jun. 1989.
5. Baker-Jarvis, J., M. D. Janezic, B. F. Riddle, R. T. Johnk, P. Kabos, C. L. Holloway, R. G. Geyer, and C. A. Grosvenor, Measuring the Permittivity and Permeability of Lossy Materials: Solids, Liquids, Metals, Building Materials and Negative-index Materials, National Institute of Standards and Technology, Boulder, CO., Tech. Note 1536, 2004.
6. Baker-Jarvis, J., R. G. Geyer, J. H. Grosvenor, Jr., M. D. Janezic, C. A. Jones, B. Riddle, C. M. Weil, and J. Krupka, "Dielectric characterization of low-loss materials: A comparison of techniques," IEEE Trans. Dielectr. Electr. Insul., Vol. 5, No. 4, 571-577, Aug. 1998.
doi:10.1109/94.708274
7. Baek, K.-H., H.-Y. Sung, and W. S. Park, "A 3-position transmission/reflection method for measuring the permittivity of low loss materials," Proc. IEEE, Vol. 5, No. 1, Jan. 1995.
8. Nicolson, A. M. and G. Ross, "Measurement of intrinsic properties of materials by time domain techniques," IEEE Transactions on Instum. Meas., Vol. 19, 377-382, Nov. 1970.
9. Weir, W. B., "Automatic measurement of complex dielectric constant and permeability at microwave frequencies," Proc. IEEE, Vol. 62, 33-36, Jan. 1974.
doi:10.1109/PROC.1974.9382
10. Javan, M., M. F. Frechette, M. Lessard, R. Bartnikas, K. Cole, and D. Desgagnes, "Dielectric characterization of a nanostructured polymer microcomposite and its constituents," Proc. IEEE, 252-255, Oct. 2007.
11. Jung, H.-K., Y.-S. Hwang, I.-J. Hyeon, Y.-K. Kil, and C.-W. Baek, "Silicon/quartz bonding and quartz deep RIE for the fabrication of quartz resonator structures," Proc. IEEE, 1172-1176, Jan. 2008.
12. Gui, Y. F., W. B. Dou, P. G. Su, and K. Yin, "Improvement of open resonator technique for dielectric measurement at millimetre wavelengths," Proc. IEEE, 1036-1043, Oct. 2009.
13. Shajedul Hasan , I, S. M., M. Sundaram, Y. Kang, and M. K. Howlader, "Measurement of dielectric properties of materials using transmission/re°ection method with material filled transmission line," IMTC, Vol. 1, 72-77, May 2005.
14. Janezic, M. D. and J. A. Jargon, "Complex permittivity determination from propagation constant measurements," Proc. IEEE, Vol. 9, No. 2, Feb. 1999.
15. Jing, S., D. Ding, and Q. Jiang, "Measurement of electromagnetic properties of materials using transmission/reflection method in coaxial line," Proc. IEEE, 590-595, Nov. 2003.
16. Vanzura, E. J., J. R. Baker-Jarvis, J. H. Grosvenor, and M. D. Janezic, "Intercomparison of permittivity measurements using the transmission reflection method in 7-mm coaxial transmission lines," Proc. IEEE, Vol. 42, No. 11, 2063-2070, Nov. 1994.
17. Simpkin, R., "Derivation of Lichtenecker's logarithmic mixture formula from Maxwell's equations," Proc. IEEE, Vol. 58, No. 3, 545-550, Mar. 2010.
18. Arcone, S. A. and G. E. Boitnott, "Complex permittivity of common minerals and one soil at low water contents," Proc. IEEE, 1-5, Jun. 2010.
Submit
